There is a new narrow band weak signal mode for LF/MF by ZL2AFP. This mode is like PSK but not exactly like it. ZL2AFP CMSK advances or retards the frequency to get a 180 degree phase shift in one bit period. The program window and waterfall remind me of The FLdigi program, only a little simpler. I have not tried this mode yet but it looks interesting. For more information:
http://www.qsl.net/zl1bpu/CMSK/cmsk.htm
http://www.qsl.net/zl1bpu/CMSK/cmskhelp.htm
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